Uniformat D3020

Non-condensing hot water boiler

A non-condensing hot water boiler lasts about 25 years, the median of 3 published sources, which state 25–26.9 years.

Also listed as Boiler, hot water, non-condensing, atmospheric boiler, cast iron boiler, hot water boiler

• Confidence B
• Version 0.6.0 (permanent link)
• Reviewed 2026-10-23

Service life

Years in service. The band runs from the shortest to the longest life the sources state, so it shows how much they disagree, not how long 80% of units last. The line is the median of the stated lives.

Work out when yours is due for replacement

Basis

• 25 years · CNA e-Tool Estimated Useful Life Table, p10 · HUD CNA 3.4.1.2.9 “Boilers, Gas Fired, Sectional” — U.S. Department of Housing and Urban Development (planning life)
  Same life for family and elderly properties. US multifamily housing. HUD does not separate condensing from non-condensing boilers; its gas-fired sectional and atmospheric rows describe non-condensing types. Its oil/gas/dual-fuel rows (30 years low MBH, 40 years high MBH) are not used because they do not say which kind.
• 25 years · CNA e-Tool Estimated Useful Life Table, p10 · HUD CNA 3.4.1.2.12 “Boilers, Gas Fired Atmospheric” — U.S. Department of Housing and Urban Development (planning life)
  Same life for family and elderly properties. US multifamily housing.
• 26.9 years · Energy Conservation Program: Energy Conservation Standards for Consumer Boilers (notice of proposed rulemaking), 88 FR 55128, August 14, 2023, p3 · I.A “"average lifetime of consumer boilers, which is estimated to be 26.9 years for gas-fired hot water boilers"” — U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (planning life)
  Printed page 55130. Consumer (residential, under 300,000 Btu/h input) gas-fired hot-water boilers, condensing and non-condensing given the same lifetime. DOE's analysis includes consumer boilers installed in commercial buildings. Also in Table IV.9 (PDF p.34, printed 55161): 'GHW: 26.9 years'.
• 25 years · Updated Buildings Sector Appliance and Equipment Costs and Efficiencies (March 2023), Appendix A: EIA - Technology Forecast Updates - Residential and Commercial Building Technologies - Reference Case (Guidehouse and Leidos, March 3, 2023), p123 · Commercial Gas-Fired Boilers “Average Life (y): 2018 installed base 25; 2022 typical (85% thermal efficiency) 25, high (99%) 25; same through 2050” — U.S. Energy Information Administration; Appendix A prepared by Guidehouse and Leidos (planning life)
  Printed page 119 (Appendix A). Commercial packaged gas-fired hot-water boiler, 800 kBtu/h input (note 1: small 300-2,500 kBtu/h hot water class). The 85% 'typical' is non-condensing and the 99% 'high' is condensing; both carry 25 years. The 2012 installed-base column shows 30 years. The data-source sheet (PDF p.231, A-51) labels the life source only under the 2012 column, as 'Comm. Heating, AC, WH EERE 2009' (a DOE analysis); the 2018-and-later life cells have no separate label.

How sources are chosen and recorded: sourcing policy.

Preventive maintenance

35 tasks in 4 work orders. Intervals that fall due together are one visit: the annual visit also covers the monthly tasks.

1. 1Monthly
2. 2Monthly
3. 3Monthly
4. 4Monthly
5. 5Monthly
6. 6Monthly
7. 7Monthly
8. 8Monthly
9. 9Monthly
10. 10Monthly
11. 11Monthly
12. 12Annual

Months from the schedule start. Daily and weekly rounds run in between. Download the tasks as CSV for a CMMS, or ask the MCP tool get_pm_schedule for dated visits.

Frequencies are ISO 8601 durations in the data (P3M = every 3 months).

Open questions

• Every source here is a published planning, design or accounting life. None is observed replacement data.

Know the answer? Send it with a source to [email protected].

Cite this

Citation

unfinished.one (2026). Boiler, hot water, non-condensing, v0.6.0. https://unfinished.one/c/boiler-hw-noncondensing/v/0.6.0

BibTeX

@misc{unfinished_boiler_hw_noncondensing_0_6_0,
  title = {Boiler, hot water, non-condensing},
  author = {{unfinished.one}},
  year = {2026},
  version = {0.6.0},
  url = {https://unfinished.one/c/boiler-hw-noncondensing/v/0.6.0},
  note = {CC BY 4.0}
}

Licence CC BY 4.0 · How to cite · JSON · Versions: 0.6.0, 0.4.0, 0.3.0, 0.2.0, 0.1.0